If someone runs into a room and, blocking both ears with his fingers, starts to shout: don’t try to use reason, don’t even talk.
There’s every chance that all such a person wants is to see you flinch, to see that you’ve been hurt – that’s the payoff.
Let them get their fix, then carry on with your life – it’s full of people who live on more wholesome sustenance.
I prefer to do the fixing with a neatly-executed punch on the nose.
Take that, you cretins!! 😉